I would like to port the DOOM source code into embedded system for the interesting experience and in order to evaluate my system.
I have a 32bit CPU platform witch I can compile ‘c’ code on it.
Technically I have all the capabilities that I need such as operating system, memory allocation and graphic lib.

I got the source files from the site but I have no idea were to star…
Are there any descriptions of API that I should provide in order to use the source code?
Are there any links / docs that I can use?